Hmm... (slashes mean ties):
Grass-type: This is VERY close.
Sceptile, followed by Torterra, and then Serperior. I just love Sceptile's "bipedal fighter" motif which is similar to Blaziken's, and as of now, he's the only bipedal Grass-type starter. The tail and the seeds on its back complement the design. Leaf Blade FTW.
Torterra's face is a bit odd, but it has A FREAKING FOREST ON ITS BACK. And its classification is the
Continent Pokemon. Plus, it's a sturdy-looking Grass/
Ground tank. Awesome by default, and VERY close to being my Sinnoh starter before I reconsidered Infernape.
I'm liking Serperior's name, especially as it capitalizes on Smugleaf's memetic BAness. And it's also royal, and the first snake-like Pokemon that isn't Grass! Should have been Grass/
Dragon, though, because I really don't see how that type combination can be pulled off decently without us getting a funky-looking leaf dragon, or a draconic grass snake in the vein of Serperior.
Venusaur receives an honorable mention for being a classic bulbous dinosaur. ^^
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Fire-type: EXTREMELY close as well.
Blaziken, followed by Charizard, followed by Emboar/Typhlosion, followed by Infernape. But seriously, all of the Fire-types are awesome;
none have disappointed me yet (eh, except during the Emboar leak, but I've QUICKLY gotten over that).
Blaziken has white "hair" of awesomeness, with burning wrists, and skyscraper-defying LEAPS. BURNING JUSTICE incarnate. And the ORIGINAL FireFighter starter. A docile, yet fierce, partner for Pokemon battles.
Now Charizard is just
classic. A flaming dragon with a menacing roar and utter BAness, with shining blue eyes that are brimming with courage and hope. Awesome.
Emboar: a
black Chinese BOAR BOMB with absurd reckless attacks. Awesome as well.
Typhlosion: the volcanic badger manifestation of typhoons
and explosions. With flames bursting to back it. Awesomeness.
Infernape: MONKEY KING STARTER!!!! Nice blue accents, with flames shooting from its
head. The conclusion of fiery AWESOMENESS.
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Water-type:
Blastoise. Probably followed by Feraligatr/Swampert, followed by Empoleon/Samurott.
Blastoise is well designed, backed with HYDRO CANNONS that unleash nightmarish torrents of water on its foes. WHY isn't it Water/Steel?
Feraligatr has a nice, "corrupted" name, with a classic, crocodilian look. Swampert is a classic tank as well, and looks like "watery rushdowns" personified.
I hate that Empoleon's sprites do not feature "true" black, because that boosts its design by a lot. It can look frumpy at times, but usually, it can be BA.
Bipedal Samurott looks freaking awesome. I still have slight qualms with the somewhat-extraneous mustache and weird-looking
Murex helmet shell, but he's getting to be decent.
For some reason, I feel that Numel/Camerupt and Tropius should be starters as well...